An illustration of the genus Cinchona : comprising descriptions of all the officinal Peruvian barks, including several new species : Baron de Humboldt's Account of the Cinchona forests of South America, and Laubert's Memoir on the different species of Quinquina : to which are added several dissertations of Don Hippolito Ruiz on various medicinal plants of South America ... and a short account of the spikenard of the ancients ...